William Peterson’s character from “CSI: Crime Scene Investigation,” Gill Grissom, leaves the series with the broadcast of two episodes on Thursday night on CBS. Many fans will fill their eyes with tears after they had spent nearly eight years watching Grissom examining dead bodies and searching for murder clues.

Yet, in Grissom’s last episode of “CSI” he manages to find someone to replace him. Dr. Raymond Langston, interpreted by Laurence Fishburne, is a pathologist and a college professor who has been created to share the same ideas with Grissom.

But not only Dr. Raymond Langston is supposed to replace Grissom, now that the new CBS’s series “The Mentalist” has started out. Simon Baker, who plays Patrick Jane on the TV series, is also a threat to replace Dr. Grissom and the “CSI’s” legacy.

On the last episode of “CSI,” entitled “People lie,” Grissom, who plays the role of the main investigator in the show, talks about the work he had done in his life as a crime scene investigator. “The only thing we can count on is evidence,” he tells Langston. The last episode adapts to everyday life and Grissom’s speech is held not only for Langston, but for all his fans who have watched him for nine seasons.

“CSI: Crime Scene Investigation” was created by Anthony E. Zuiker and its first episode was aired on October 6, 2000. The series usually air on Thursdays, starting 9 p.m. on CBS.

The plot of the show is connected to the cases of the Crime Scene Investigation division of the Las Vegas Police Department. Zuiker chose Las Vegas to shot the series because the crime lab there is the second most active in the United States.

The team solves crime cases through scientific evidences, which may also lead to different conclusion of the case. Beneath the action that takes place during every episode, at the end of it there is always a conclusion of the case which makes you ask interesting questions to yourself.